Penetrating Keratoplasty.

Front 1

The procedure that involves a patient's diseased or distorted cornea removed and replaced with clear donor tissue is called:

Back 1

Penetrating Keratoplasty.

Front 2

Penetrating Keratoplasty (PK) is a procedure that involves:

Back 2

a patient's diseased or distorted cornea removed and replaced with clear donor tissue.

Front 3

Approximately half of the patients following penetrating keratoplasty require this to achieve their best visual potential:

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contact lenses

Front 4

Patients with this ocular condition are treated by PK's more than any other condition:

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Pseudophakic Corneal Edema (PCE)

Front 5

After penetrating keratoplasty, corneal relaxing incisions or wedge resections may be necessary to reduce:

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The large amounts of astigmatism that may be onset following Penetrating Keratoplasty surgery.

Front 6

The large amounts of astigmatism that may be onset following Penetrating Keratoplasty are managed surgically by:

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Corneal relaxing incisions or wedge resections.

Front 7

Rehabilitation of a corneal graft begins:

a. centrally and works it's way outward.

b. peripherally​ and works it's way inward.

Back 7

a. centrally and works it's way outward.

Front 8

The instrument that illustrates concentric rings over the cornea is called:

The closer the rings are together indicate.

Back 8

photokeratoscopy.

steeper curvatures.

Front 9

When fitting a patient for contact lenses post PK's and any sutures are exposed causing a break in the epithelium, these preventions should be taken:

Back 9

fitting contacts delayed and patient referred back to the surgeon.

Front 10

Following penetrating keratoplasty, many surgeons believe that sutures that remain buried and free from vascularization can:

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remain in place indefinitely.

Front 11

Exposed sutures are best observed by:

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slit lamp and the use of a cobalt blue filter after the application of fluorescein.

Front 12

Patients who require transplants due to Fuch's dystophy or bullous keratopathy may result in this abnormality of the host cornea:

It may complicate this type of contact lens wear:

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small bullae.

rigid lenses.

Front 13

Post operative corneas are classified as coming in these 4 different forms:

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1. normal aspheric topography.

2. flat central and steep peripheral topography.

3. graft tilt.

4. central steepening (graph bulge).

Front 14

Penetrating Keratoplasty resulting in normal aspheric topography is characterized as:

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the central cornea has a steeper radius of curvature surrounded by 360° of concentric peripheral corneal flattening.

Front 15

Penetrating Keratoplasty resulting in flat central and steep peripheral topography is characterized as:

It's also known to resemble this:

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the central donor cornea is flatter than the peripheral cornea with a mid-peripheral knee created at the graph-host interface.

drumhead.

Front 16

Rigid lens designs based on central "K" readings will always err on the flat side of what will be required with this topographic corneal form:

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central flat and steep peripheral topography.

Front 17

Penetrating Keratoplasty resulting in graft tilt topography is characterized as:

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one portion of the graft is steep and the topography of the cornea 180° away (along the same axis) is flat.

Front 18

Penetrating Keratoplasty resulting in central steepening (graft bulge) topography is characterized as:

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the entire graft may bulge to create an almost keratoglobus appearance.

Front 19

The exact mechanisms responsible for central steepening (graft bulge) topography is unclear but may be related to:

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changes in intraocular pressure post-operatively.

Front 20

The scar at the edge of a corneal graft following penetrating keratoplasty can resemble this:

This habit should be developed to prevent harm to the graft:

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The edge of a rigid lens.

Cover the opposite eye and verify acuity to confirm the rigid lens is not displaced so the patient is attempting to remove the lens not the graft.

Front 21

It is generally not recommended to use this rigid contact lens removal technique while a corneal graft is not healed following penetrating keratoplasty:

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DMV (plunger)

Front 22

The age of patients requiring penetrating keratoplasty:

a. can range from 1-90 years old.

b. is always over 40 years old.

c. Is not a factor in post-surgical success.

d. Is always under 50 years old.

Back 22

a. can range from 1-90 years old.

Front 23

A penetrating keratoplasty patient may be considered a candidate for a back or bitoric rigid gas permeable lens if:

a. the astigmatism is irregular.

b. The astigmatism is regular and runs completely through the cornea.

c. The astigmatism is central and regular.

d. A bitoric should never be considered.

Back 23

b. The astigmatism is regular and runs completely through the cornea.

Front 24

In order to appreciate any change in fit between successive diagnostic lenses, the change in base curve should be at least:

a. 0.25D

b. 0.50D

c. 1.00D

d. 1.50D

Back 24

c. 1.00D

Front 25

If peripheral information is not available, a PK patient can be successfully fit by:

a. Diagnostic fitting.

b. "K's" and Rx.

c. Nomogram.

d. Empirical fitting.

Back 25

a. Diagnostic fitting.

Front 26

The major complication to post operative penetrating keratoplasty is:

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Astigmatism.

Front 27

A rigid contact lens will always move in this direction:

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the direction of least resistance. (Steepest corneal meridian)